package com.itheima.servlet.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter(value ={ "/addStudent.jsp","listStudent.jsp"})

public class LoginFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse sponse = (HttpServletResponse) servletResponse;
        Object username = request.getSession().getAttribute("username");
        if (username==null||"".equals(username)){
            sponse.sendRedirect(request.getContextPath()+"/stu/login.jsp");
            return;

        }
        filterChain.doFilter(request,sponse);

    }
}
